This paper describes the facies modeling results of the PK1 formation on the Novo-Chaselskoye and the Zapadno-Chaselskoye fields located in the north of Western Siberia. The target object (PK1 formation) is characterized by extremely high lateral and vertical heterogeneity, unstable properties and lithological variability. All these structural features of the object are due to its polygenic composition. According to regional data, the accumulation of the PK1 formation occurred within the coastal accumulative plain, periodically flooded by the sea. Four sediment parasequences were defined in the PK1 formation based on facial core analysis, log data interpretation and seismic: continental sediments (PK14), transition zone sediments (PK13, PK12) and coastal marine sediments (PK11). 2D facies maps were constructed for each parasequence. Relations between permeability and porosity were defined for each facies group, forecast maps of reservoir prospective zones were constructed. It was defined that sand sediments of river channels (PK14), tidal channels (PK13, PK12) and prefrontal beach areas (PK11) have the best reservoir properties. At the bottom of the PK1 formation there are river channel and tidal channel sediments which have the highest permeability. This factor can be one of the reasons of the early water breakthrough during the production drilling in the superimposed channel zones. Final results of this work let us determine the optimal wells positions to achieve planned production levels and reduce risks of the early water breakthrough.
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